/// <summary>
/// 转换数据为<see cref="UserExamQuestionSummary"/>类型数据
/// </summary>
/// <param name="results"></param>
/// <returns></returns>
private IEnumerable <UserExamQuestionSummary> ConvertToQuestionSummary(IEnumerable <UserExamQuestionResult> results)
{
if (results == null)
{
yield break;
}
//题目ID集合
var questionIds = results.Select(p => p.QuestionId).ToArray();
//获取各题的正确答案
var rightAnswers = QuestionsAccessor.GetAnswersFor(questionIds);
//循环处理数据类型，并添加上正确答案
foreach (var item in results)
{
//本题的正确答案（或参考答案）
var answerJsonData = rightAnswers.ContainsKey(item.QuestionId) ? rightAnswers[item.QuestionId] : string.Empty;
//反序列化出答案（或解析）内容
var deserContext = new AnswerDeserializeContext(item.Type);
var answers = deserContext.Deserialize(answerJsonData);
//过滤出正确的答案选项编号（或解析内容）
var rightCodeArray = RightAnswersFilter(answers, item.Type);
//题目摘要数据对象
var summary = new UserExamQuestionSummary(item);
summary.RightAnswer = rightCodeArray != null?string.Join(",", rightCodeArray) : string.Empty; //将多个正确答案（或答案解析内容）用英文逗号分隔
yield return(summary);
}
}
/// <summary>
/// 将题目答案项反序化为对应的数据对象
/// </summary>
/// <param name="answers"></param>
/// <param name="questionType"></param>
/// <returns></returns>
public static QuestionAnswer DeserializeAnswers(string answers, int questionType)
{
var context = new AnswerDeserializeContext(questionType);
return(context.Deserialize(answers));
}
